Device for dressing grinding wheels and the like



May 1, 1945. J BLAZEK 2,374,726

DEVICE FOR DRESSING GRINDING WHEELS AND THE LIKE Filed May 22, 1943 2Sheets-Sheet l INVENTOR. JOHN Y BLAZEK .ATTOR NEYS.

F16. 4 45 m $3 i -9 y 1945- .a. Y. BLAZEK 2,374,726

DEVICE FOR DRESSING GRINDING, WHEELS AND THE LIKE Filed May 22, 1943 2Sheets-Sheet 2 9 I 2 FIGS 31%, Y B INVENTOR. 26 -5 don-IN LAZEK & B27 IZ 516.5 @W M ATTORNEYS Patented May 1, 19.45 I

DEVICEFOB DRESSING GRINDHVG WHEELS AND THE LIKE John Y. Bl'azelr,Redford, Ohio, assignor' to Lempoo: Products, 11102,

ration of Ohio .Bedford', Ohio, at corpo- Application May 22, 1943,Serial No. 488,020

7' Claims.

This invention relates, as indicated,.to devicesfor dressing grinding.wheels andthe like.

A. primary object of the. invention is to. pro vide. a device fordressing grinding wheels in which means are provided. for clamping thedevice to the work to be. ground, and for aligning the dressing tool.and grinding wheel with the work. to be ground.

Another object of the invention is to provide a device of the characterdescribed having a dressing tool holder mounted for movement enablingradii to be ground on a grinding wheel, and having means incorporatedtherein. for limiting the movement of the holder beyond predeterminedpositions during. such grinding.

A further object of. the invention is to provide a device of the,character described having novel means for clamping the dressing toolholder in a fixed position to. enable the face of a grinding wheel tobev dressed.

Other objects and advantages of the invention. will be apparent duringthe course of the following description.

In the accompanying drawings, forming a part of this specification, andin which like numerals" are employed to designate like parts throughoutthe same.

Fig; I is a view, partly in elevation, and partly in section, of adevice embodying the invention; Fig. 2' is a fragmentary elevational"view of a portion of the device, as viewed in. the direction indicatedby the line 2-2 of. Fig; 1;

Fig. 3 is. a cross-sectional view, taken on. the

line 3t-3'of Fig. 2';

4' isa fragmentary cross-sectional view, taken on the line 4'4" of Fig.l;

. Fig: 5 is a fragmentary cross-sectional view, taken on the. line 5.-5of Fig, I;

which is' to be ground on a grinding'wheel, and

Fig. 9" is a side elevation of the gauge assembly;

Referring more particularly to the drawings, it will be: seen that thedevice comprises a supporting bar: I having secured to and extendinglaterally from the upper end. thereof a bracket 2, the. bracket beingsecured to the bar I' by means of socket head cap screws 31. v

The bracket 2' has a' bearing 4 disposed therein adjacent its outer end,this bearing being secured in position by means of a" socket head setscrew 5 having a; dog point. v

The bearing 4 has a conical surface 6' which forms a; seat for theconical intermediate portion. 1 of a driving pin, theupper' portion 8of" which extends through the bracket 2", and has securedthereto a crankhandle 9', and the lower portion I0 of which is secured, as by" means ofa taper pin l I, to a dressing. tool holder l2.

The supporting bar I has secured to andextending laterally from thelower end thereof, a bracket I3, this bracket being secured to-thebar Iby means of socket head cap screws M1 The bracket I13 has threadedlysecured therein, alignment with the driving pin I -B -IO, a slotted headset screw I5 having a dog point I'G which serves asathrust bearing forthe lower end of the .tool holder 12, the point. It being seated in aseat el'ement' I'I', secured in' position by means of a socket'head setscrew I 8 having" a dog point engaging this element. The set screw I5"may be adjusted to take up wearbetwee'n the pointy I6 thereof and theseat element I1, and is locked in adjusted position by means of alock-nut IQ.

It will be noted that the brackets 2 and P3 are curved to conform withthe curved ends of the tool holder I2, and'that the tool" holder" hassecured therein. at a; point substantially midway of its ends; adiamondapointed' dressing tool 26', which may be adjusted axially'andlocked in ad'- justed position by means of asocket' head set screw 2|having a cone point engaging. the tool.

For the purpose of locking the tool holder I2 to the bar I, as whengrinding a fiat face on a grinding wheel, in a manner tobe presentlydescribed, a set screw 22' isfprovide'd, having a cone point 23 at oneend, and a' knurled collar 24 secured to the head thereof, the" screwbeing threadedly mounted in the holder I2. When the holder I2 is to belocked to theiba'r I', the screw'2'1 is: rotated so as'to causetheconepoint 23 thereof to extend into a V-shaped recess. 25 inthe adjacentface of the bar I.

The "device further includes a; work gripping clamp 25' which iscoplanar with. the bar I' and brackets 2 and I3, and whichmay be.vertically adjustedrelatively to thebar I. For this purpose, the clampis recessed at its. edge 21 to fit a guide'way or tenon 28 whichprojects from. the bar II, this tenon thusserving ta maintain theclampifi coplanar with the bar allf adjusted positions. The clamp issecured to the. bard by means of socket head cap screws 29, the heads ofwhich are disposed in recesses 30 in the bar I and the stems of whichextend through slots 3| in the bar I and into the clamp 26. To adjustthe clamp 26, all that is necessary-is to loosen the screws 29, move theclamp upwardly or downwardly, and then tighten these screws.

The clamp 26 is provided with a V-seat 32 for the work to be ground, andwith a cooperating clamping element 33 which is threadedly secured tothe clamp 26 and is provided with a handle 34 for manipulating theclamping element.

A small level 35, whose function will'be presently described, is mountedon the upper edge 36 of the clamp, and is secured to such edge by -meansof clips 31.

The device further includes a scale 38 which is secured to one side ofthe bar I, and the purpose of which will also be presently described.

Having thus described the general constructional features of the device,the two principal uses thereof will now be described.

The first of these uses involves the dressing or truing of theperipheral face F, of a grinding Wheel GW, which, for example, is to beused to grind a crankshaft C, it being assumed that in the grindingmachine on which the crankshaft is mounted to be ground, that the wheelGW is movable away from the crankshaft sufiiciently to permit thedressing device-.to be attached to the crankshaft in the manner shown inFig. 1.

If the crankshaft is four inches in diameter, the clamp 26 is firstadjusted so as to bring the index line 39 thereof in alignment with the4 inch mark on the scale 38, after which the clamp is securely fastenedto the bar I by means of the screws 29. The clamp 26 is then secured tothe crankshaft, by causing the crankshaft to seat in K tire device beingfirst adjusted, however, to insure that the level 35 indicates that barI is vertical.

The holder I2 is then looked to the bar I in the manner hereinbeforedescribed, so that the point of the dressing tool 20 is in horizontalaligmnent with the center of the crankshaft, as well as the center ofthe wheel GW.

With the parts thus positioned, the wheel GW is brought into engagementwith the tool 20, and is moved axially by any suitable traversing means,so as to cause the tool 20 to grind or dress the peripheral face F ofthe wheel, as diagrammatically indicated in Fig. 6, it being understoodthat the grinding wheel is rotated at a suitable speed during thisdressing operation. I

After the wheel has been properly dressed, the dressing device isremoved, so as to permit the grinding wheel to be brought into operativegrinding relation to the crankshaft C, which is to be ground.

The other use-of the device involves the grinding or dressing of aradius on the peripheral face of the grinding wheel.

For this purpose, the device is set up and adjusted as previously, butthe radius to be ground is first determined by means of a locating gaugesuch as shown in Figs. 8 and 9, said gauge comprising a round bar 40having a flattened surface M to which is secured a scale 42, along whicha toollocating element 43 may be adjusted to any desired position, andlocked in adjusted position by means of a set screw 44. The hardened end45 of the bar 40 is first brought into engagement with a hardened steelinsert 46 in the bar I2. The element 43 of the gauge is then set at aposition on the scale which represents the radius to which the wheel isto be dressed, after which the dressing tool 20 is adjusted in the toolholder I2 so as to bring the' diamond point thereof into engagement withthe face 41 of the element 43, so that the tool 20 is now set to producethe desired radius on the wheel.

The set screw 2! is then withdrawn from the recess 25 in the bar I, soas to permit the tool holder l2 to be rotated about its pivotal axis.

The grinding wheel GW is then brought into engagement with the diamondpoint 20, and the wheel is rotated as the holder I2 is rotated about itspivotal axis by means of the handle 9, so as to grind a radius Ran theface of the grinding wheel, as shown in Fig. 7.

In order to insure the diamond point from passing the diametral plane DDof the grinding wheel, when a radius is to be ground on only one side ofthis plane, the bracket 2 is provided with a thumb screw 48 at each sidethereof, which thumb screw, when moved into the path of the holder I2,prevents the holder from moving beyond the plane in which it is shown inFig. 1.

Movement of the holder in the opposite direction is limited by one ofthe stops 49, which dependfrom the bracket 2, and have flat surfaces 50against which the holder I2 impinges to prevent the diamond point frombiting into the grinding wheel, which would occur if the tool werepermitted to move beyond the extremity of the radius which is to beground.

After the radius has been ground, the device is removed, so as to permitthe wheel to be brought into operative engagement with the work to beground.

It is to be understood that the form of my invention, herewith shown anddescribed, is to be taken as a preferred example of the same, and thatvarious changes in the shape, size and arrangement of parts may beresorted to, without departing from the spirit of my invention, or thescope of the subjoined claims.

Having thus described my invention, I claim:

1. In a device of the character described, a supporting bar, a clampsecured to said bar and adjustable therealong, said clamp adapted to beclamped to work to be ground, and a dressing tool holder pivotallymounted on said supporting bar.

2. In a device of the character described, a supporting bar, a clampsecured to said bar and adjustable therealong, said clamp adapted to beclamped to work to be ground, a dressing tool holder pivotally mountedon said supporting bar, and means on said clamp for indicating a levelposition of the clamp when clamped to said work.

3. In a deviceof the character described, a supporting bar, workclamping means secured to said bar and movable therealong, and adressing tool holder pivotally mounted on said supporting bar.

4. In a device of the character described, a supporting bar, meanssecured to said bar and adapted to be clamped to work to be ground, saidmeans being adjustable along said bar, and a dressing tool holdermounted on said bar.

5. In a device of the character described, a supporting bar, meansindependent of and secured to said bar and adaptedto be clamped to workto be ground, and a dressing tool holder pivotally mounted on said bar,said holder being independent of said bar.

6. In adevice of the character described, a supporting bar, workclamping means comprising determining the position of one bar relativelyto the other for work of different diameters to be clamped by saidwork-clamping means;

7. A device, as defined in claim 6, in which said last-named meanscomprises a scale on one of said bars and an index line on the other,said scale and line cooperating to'indicate the position of the barsrelatively to each other for work of difierent diameters to be clampedby said work- 10 clamping means.

JOHN Y. BLAZEK.

